Variables Review Dependent Variable n What is being
Variables Review
Dependent Variable n What is being tested or measured.
Independent Variable n What the Scientist is changing.
How can I remember? DEPENDENT VARIABLE depends on the INDEPENDENT VARIABLE
Example 1 n The time it takes to run a mile depends on the amount of daily exercise a person gets
Answer n D. V. – the time it takes to run a mile n I. V. – the amount of exercise the person is getting
Example 2 n The higher the temperature of water, the faster an egg will cook.
Answer n D. V. – the time it takes to boil the egg n I. V. – the temperature of the water
Example 3 n An investigation was conducted to see if keeping the lights on for different amounts of time each day affected the number of eggs chickens laid.
Answer n D. V. – the number of eggs laid n I. V. – the amount of time the light is left on
Example 4 n The amount of pollution produced by cars was measured using gasoline containing different amounts of additive.
Answer n D. V. – the amount of pollution n I. V. – the amount of additive in the gasoline
Example 5 n Lemon trees receiving the most water produce the largest lemons.
Answer n D. V. – the size of the lemons n I. V. - the amount of water that the tree receives
Example 6 n The amount of algae growth in a lake seems to be directly related to the number of bags of fertilizer sold by the local merchants.
Answer n D. V. – The amount of algae in the lake n I. V. – the amount of fertilizer sold by the local merchants
Example 7 n Five groups of rats are fed identical diets except for the amount of Vitamin A that they receive. Each group gets a different amount. After three weeks on the diet, the rats are weighed to see if the amount of Vitamin A received affected their mass.
Answer n D. V. – the mass of the rat n I. V. – the amount of vitamin C that the rat receives each day.
Example 8 n Will the number of nails picked up by a magnet increase if the magnet is stronger?
Answer n D. V. – the number of nails that the magnet can pick up n I. V. - the strength of the magnet
Example 9 n Students in science class conducted an investigation in which a flashlight was pointed at a screen. They wished to find out if the distance from the light to the screen had any affect on the size of the illuminated area.
Answer n D. V. – the size of the illuminated area n I. V. – the distance from the screen
Example 10 n The farther a ball is dropped, the higher it will bounce.
Answer n D. V. – the height of the bounce n I. V. – the height of the drop
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